Test of shear resistance of modified emulsified asphalt by waterborne epoxy resin
1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang′an University, Xi′an， Shaanxi 710064， China; 2. Xuchang Huajie Highway Survey and Design Co., Ltd, Xuchang， Henan 461000， China; 3. Lanzhou Branch of Shanghai Municipal Engineering Design Institute, Lanzhou， Gansu 730030， China
Abstract：To solve the diseases of slippage and surge of pavement structure due to the lack of interlayer cohesive force performance of asphalt pavement, the shear strength of epoxy emulsified asphalt tack coat was investigated for different epoxy emulsified asphalt distributing amount, test temperature and normal stress. Mohr-Coulomb principle was used to obtain cohesive force and internal friction angle. The interlayer shear stresses of five kinds of typical pavement structures were calculated by finite element software Ansys. The shear fatigue performance and the shear strength performance of epoxy emulsified asphalt were tested based on the calculation of interlayer maximum shear stress and shear strength. The results indicate that the shear strength increases with the increasing of normal stress by approximately linear trend, and the optimum epoxy emulsified asphalt distributing amount is 0.8 kg·m-2 at high temperature of 60 ℃. When distributing amount and normal stress are the same, the shear strength decreases with the increasing of temperature due to the decreasing of cohesive force. The maximum interlayer shear stress under the loads of 100 and 200 kN are respectively less than allowable shear stress and shear strength, and the shear fatigue damage and the ultimate shear failure at high temperature and heavy load are not generated on the asphalt surface.
2017, Vol. 38 
